221383949 has 2 divisors, whose sum is σ = 221383950. Its totient is φ = 221383948.

The previous prime is 221383907. The next prime is 221383957. The reversal of 221383949 is 949383122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210540100 + 10843849 = 14510^2 + 3293^2 .

It is a cyclic number.

It is not a de Polignac number, because 221383949 - 2¹⁶ = 221318413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221383249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110691974 + 110691975.

It is an arithmetic number, because the mean of its divisors is an integer number (110691975).

Almost surely, 2^221383949 is an apocalyptic number.

It is an amenable number.

221383949 is a deficient number, since it is larger than the sum of its proper divisors (1).

221383949 is an equidigital number, since it uses as much as digits as its factorization.

221383949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 221383949 is about 14878.9767457309. The cubic root of 221383949 is about 604.9442828274.

The spelling of 221383949 in words is "two hundred twenty-one million, three hundred eighty-three thousand, nine hundred forty-nine".